Improvement in driers



stun-i (tjijiirr.

EDMUND 'rnownmocn AND JAMES- M. JONES, 013 DETROIT, MICHIGAN.

Letters Patent No. 107,982, dated October 4, 1870, V

'IMPROVEMEN'I: IN DRIERS.

e The Schedule referred to in these Letters Patent and making part of the same.

To whom itmay concern:

' Be it known that we, EDMUND ,Teownmncn and JAMES M.- JONES, of Detroit, in the county of Wayne and State of Michigan, have invented a new and useful Improvement in Drying-Kilns; and we do declare that the following is a trneand accurate description thereof, reference being had to the accompanying drawing and to the letters of reference marked thereon, and

i being a part of this specificationfiu which Figure 1 is a perspective view of our apparatus;

Figure 2 is a vertical section across the rear end of the boilers.'

Figure 3 is a vertical section, longitudinally, between the boilers.

Like letters indicate like parts in each figure.

{lh'e nature of this invention relates to the employment of steam and hot air iuakiln of peculiar construction fordrying purposes and consists in alpeculiararrangement' of the various parts, by means of avhich steam is injected into the kiln, and in the arrangement for heating and injecting hot air, as more fully hereinafter described. v

' In the accompanying drawing- A. represents a kiln, constructed with close-fitting doors B at each end, through which cars loaded with lumber, or other articles to be dried may be run into and out of the kiln upoifirsuitablc railway-track laid therein. 5 o

A series of these kilns may be built side by side,

' and their roofs should be tight, and without any open;

ings therein'for the escape of the hot air or steam; O is a rotary i .an,-d1ivenv by the engine 1), which forces cold air through the pipe E, which is extended under the boilers, inicoils or otherwise, in such a man nor as to be presented to'the fire in order to heat the an-., The pipe is then carried through the side of the kiln, as shown in fig. 2, or, where a series of kilns is built, it is extended'through each one, and is provided with short branches, F, which are, in turn, provided with shut-ofl' valves G, which are opened and closed, as occasion may require, from the outside ofthe kilns, by suitable rods H, connecting with the valves and extending through the wall of the kiln.

I is a steam-pipe, which takes steam from'thc boilers J, and carries it into the kilns, as shown in fig. 2, the end 'of the pipe being turned upward to give direction to the discharged steam. Wherever a series of kilns is employed {the pipe should be extended through it, and provided with short branches, open a't-their ends, like those above described as attached to the airpipe. Outside cut-oh" valve K, and between each of the kilns where there are more than one.-

Near the floor of the kiln, and in "the side wall thereof, is'adoor or 0pening, L, through which the air escapes. The object of placing the door in this place rather than in the top of the kiln is to compel the heated air, after injection, and risingto the top of the kiln, to descend again to the outlet, thereby utilizing it more thoroughly than ivhelrallowed to escape at the top. I i For drying lumber, this kiln is peculiarly well adapted, and its operation is as follows: a

The lumber, upon asuitablecar, is run into the kiln through the doors, which are then closed. Steam and hot air are then injectedinto the kiln through the steam and air-pipes, for the purpose of reopening the pores or sap-tubes of the lumber, which mayhave been partially closed hy'e'xposure to the .air. After this is done, the steam should be cut off and the superheated air admitted through the pipe heretofore described for that purpose. Should it be found that the hot air dries the surface of thelumber too rapidly, so that it has a tendency to check, then more steam should be injectcd'nntil this tendency is stopped. A very short time is requiredby this process to turn-out thoroughly-seasonedlumber; A

We are aware that kilns are in use wherein the dry- -ing process is performed by hot air alone, and by steam alone; therefore, we utterly disclaim them and either of them. 7

What we claim as our invention, and desire to secure by Letters Patent, isi The dry-kiln described, wherein the chamber A, the

Witnesses:

FREDERICK Ennn'rs, SAM. J SPRAY.

the kiln the pipe should be provided with 

